databases/cego: update 2.44.1 -> 2.44.3

• Fix in CegoTableManager::deleteDataTable, before resolving external table references via evalExtTableReferences, the subquery must be prepared, to resolve local attributes first
• Optimization added in CegoBufferPool::bufferFix. If there is no available slot in the bufferpool, a checkpoint is forced for the corresponding tableset ( already implemented ). Now if still no available slot, we force checkpoint for all other online tableset of the database. This might be useful, if the bufferpool is heavily occupied by other tablesets with dirty pages.

Submitted by: Bjoern Lemke <lemke@lemke-it.com>